Part of the Audubon Institute, the immense Aquarium of the Americas is loosely regional, with exhibits that delve beneath the surface of the Mississippi River, Gulf of Mexico, Caribbean Sea and far-off Amazon rainforest. The impressive Great Maya Reef lures visitors into a 30ft-long clear tunnel running through a 'submerged' Mayan city, home to exotic fish. Upstairs, the penguin colony, the sea-horse gallery and a tank for playful otters are perennially popular. In the Mississippi River Gallery, look for the rare white alligator.
On the way out, you'll pass by the the 400,000 gallon Gulf of Mexico tank – home to slowly swimming sharks that always impress the kids.
The adjacent IMAX theater screens educational and commercial movies throughout the day.